a)Styx.
b) Thank you very much (Mr. Robot). Later, when you have time, I'd like to know your secret.
c)Kilroy Was Here.
d)Kilroy was here is an American popular culture expression often seen in graffiti. It is a bald-headed man (possibly with a few hairs) with a prominent nose peeking over a wall with the fingers of each hand clutching the wall.It is widely known among U.S. residents who lived during World War II.

e)Post-modernism.